Order books include list of buy and sell orders for a specific currency pair on a specific exchange.

Order books are essential information for traders. Kaiko is the only company which stores and distributes order books for cryptocurrencies. For Bitcoin, historical data traces all the way back to August 2015. For Ethereum (ETH only, not ETC), data starts in June 2016. For others, data starts ~ oct 2016

Due to a technical problem, orderbook data for from 28 March 2017 to 8 May 2017 is temporarily only available in full orderbooks.